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Started to code the front end base layer modules.

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git-svn-id: svn://svn.cc65.org/cc65/trunk@5550 b7a2c559-68d2-44c3-8de9-860c34a00d81
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uz
2012-02-25 15:08:38 +00:00
parent 7cda476c08
commit 364eb07a59
7 changed files with 552 additions and 2 deletions
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127
src/sp65/bitmap.c Normal file
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/*****************************************************************************/
/* */
/* bitmap.c */
/* */
/* Bitmap definition for the sp65 sprite and bitmap utility */
/* */
/* */
/* */
/* (C) 2012, Ullrich von Bassewitz */
/* Roemerstrasse 52 */
/* D-70794 Filderstadt */
/* EMail: uz@cc65.org */
/* */
/* */
/* This software is provided 'as-is', without any expressed or implied */
/* warranty. In no event will the authors be held liable for any damages */
/* arising from the use of this software. */
/* */
/* Permission is granted to anyone to use this software for any purpose, */
/* including commercial applications, and to alter it and redistribute it */
/* freely, subject to the following restrictions: */
/* */
/* 1. The origin of this software must not be misrepresented; you must not */
/* claim that you wrote the original software. If you use this software */
/* in a product, an acknowledgment in the product documentation would be */
/* appreciated but is not required. */
/* 2. Altered source versions must be plainly marked as such, and must not */
/* be misrepresented as being the original software. */
/* 3. This notice may not be removed or altered from any source */
/* distribution. */
/* */
/*****************************************************************************/
/* common */
#include "check.h"
#include "xmalloc.h"
/* sp65 */
#include "bitmap.h"
#include "error.h"
/*****************************************************************************/
/* Code */
/*****************************************************************************/
Bitmap* NewBitmap (unsigned Width, unsigned Height)
/* Create a new bitmap. The type is set to unknown and the palette to NULL */
{
Bitmap* B;
/* Calculate the size of the bitmap in pixels */
unsigned long Size = (unsigned long) Width * Height;
/* Some safety checks */
PRECONDITION (Size > 0 && Size <= BM_MAX_SIZE);
/* Allocate memory */
B = xmalloc (sizeof (*B) + (Size - 1) * sizeof (B->Data[0]));
/* Initialize the data */
B->Type = bmUnknown;
SB_Init (&B->Name);
B->Width = Width;
B->Height = Height;
B->Pal = 0;
/* Return the bitmap */
return B;
}
void FreeBitmap (Bitmap* B)
/* Free a dynamically allocated bitmap */
{
/* Free the palette */
xfree (B->Pal);
}
Color GetPixelColor (const Bitmap* B, unsigned X, unsigned Y)
/* Get the color for a given pixel. For indexed bitmaps, the palette entry
* is returned.
*/
{
/* Get the pixel at the given coordinates */
Pixel P = GetPixel (B, X, Y);
/* If the bitmap has a palette, return the color from the palette. For
* simplicity, we will only check the palette, not the type.
*/
if (B->Pal) {
if (P.Index >= B->Pal->Count) {
/* Palette index is invalid */
Error ("Invalid palette index %u at position %u/%u of \"%*s\"",
P.Index, X, Y, SB_GetLen (&B->Name),
SB_GetConstBuf (&B->Name));
}
return B->Pal->Entries[P.Index];
} else {
return P.C;
}
}
Pixel GetPixel (const Bitmap* B, unsigned X, unsigned Y)
/* Return a pixel from the bitmap. The returned value may either be a color
* or a palette index, depending on the type of the bitmap.
*/
{
/* Check the coordinates */
PRECONDITION (X < B->Width && Y < B->Height);
/* Return the pixel */
return B->Data[Y * B->Width + X];
}